Composite water permeable brick and composition for producing the same

Abstract

The invention disclosed a composite permeable brick comprising a permeable surface layer and a permeable base layer. The surface layer and the permeable base layer, which respectively comprise an aggregate and a binder adhering to the aggregate, are closely combined together. The binder in the permeable surface layer at least comprises a hydrophilic binder. The permeable brick according to the invention has a good permeability and is of low cost, because of the compact and permeable surface of the brick. The invention also discloses a mixture for preparing the composite permeable brick, comprising an aggregate and a binder adhering to the aggregate. The binder at least comprises a hydrophilic binder, and the binder / aggregate ratio is from 1:100 to 20:100 by mass. The composite permeable brick and the mixture of the invention may be used for road surfacing, water circulation, water filtration and water purification, promoting the full utilization of rainwater resources and improving the urban water circulation.

Description

FIELD OF THE INVENTION[0001]This invention relates to a permeable building material, more particularly, to a permeable brick with good permeability in fields such as construction materials, rainwater collection, water filtration and purification, and a mixture for preparing such permeable articles.BACKGROUND ART[0002]At present, owing to the worldwide shortage of energy and water resources, expansion of desertification area and the frequent occurrence of sand storm, the living environment of human being is deteriorating day by day. Presently the urban residential areas are primarily surrounded by urban squares, commercial streets, pavements, areas for community activities, parking lots and the like, of which the ground is road surfaces are paved with impermeable materials such as grantie, marble, cement, and asphalt. Such hardened ground is greatly detrimental to the urban environment. When it rains, because the hardened ground completely prevents the rainwater from directly sinking...

AI Technical Summary

Benefits of technology

"The invention provides a composite permeable brick with simple structure, low cost, compact surface, and high permeability. The permeable surface layer is made of a binder and aggregate, while the permeable base layer is made of binder and binder adhering to the aggregate. The binder in the permeable surface layer is a hydrophilic binder, such as epoxy resin or polyurethane resin, which has excellent hydrophilicity. The aggregate in the permeable surface layer has a particle size of 0.05 mm to 2 mm and may be tinted with different colors. The permeable surface layer may also be added with a small amount of inorganic binder, coupling agent, and light stability agent. The composite permeable brick can be used for road surfacing, rainwater filtration, water circulation, and water purification."

Problems solved by technology

At present, owing to the worldwide shortage of energy and water resources, expansion of desertification area and the frequent occurrence of sand storm, the living environment of human being is deteriorating day by day.

Such hardened ground is greatly detrimental to the urban environment.

When it rains, because the hardened ground completely prevents the rainwater from directly sinking into the earth, the stagnant water makes it inconvenient for people to go outside, and finally the precious water resources run off through the drain pipes, thus imposing a heavy burden on urban drainage facilities; due to the mass running off of rainwater, the groundwater table is difficult to rise again and this directly influences the health of urban vegetation so that it is difficult for ground plants to grow normally and the burden on municipal greening is increased; the mass running of rainwater further aggravate the problems of drought and water scarcity.

The production of ceramic permeable brick needs a great quantity of mineral resources as raw materials, the expoitation of which damages environment.

The production process of ceramic permeable brick is complicated, and it takes considerable energy to sinter and mold ceramic substrate brick, so the production process is disadvantage in high cost, low production efficiency, huge environmental production investment and large scale of lump-sum investment.

Although the cost for producing concrete permeable bricks is low, however, the existing concrete permeable brick has coarse particles on its surface (generally, the particle size of aggregate is 3 mm to 6 mm).

Water will permeate it through the large pores with a porosity of above 20% on the surface, however, the pores are easily blocked by dusts, so the brick may not keep high permeability; it has a bad effect for water filtration due to the large pores; moreover, concrete permeable brick has monotonous color, coarse surface, poor appearance, low strength and high frangibility.

The existing polymeric material permeable bricks are hard to be popularized due to high cost of raw materials such as resin.